NF4 Factory-verified

GMC · Regular Production Option

Emission system, clean fuel fleet

Years 2001–10 Models 11 Factory citations 34
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Also described as Emission system, clean fuel, fleetEmissions, clean fuel fleet

Also documented for BuickCadillacChevroletHummerOldsmobilePontiacSaturn

Documented applications

This page aggregates every documented appearance of NF4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.